Casting machine



Sept, 8, 1925. 1,552,692

, M. D. GOODCHILD CASTING MACHINE Filed May 2, 1924 INVENTOR Patented Sept. 8, 1925.

- UNITED STATES PATENT OFFICE- MELvI LE n. GOODCHILD, or SEATTLE, WASHINGTON.

CASTING MACHINE.

' Application filed May 2,

' The invention is a simple, economical,

and efficient machine for making. dental castings or the like which is provided with a hand operated air compressor, a tank, a means for automatically permitting the compressed air to enter the mold in t-heflask as the cap engages the upper end of the flask, and meansv for. providing a positive seal between the cap and the flask which will also causesteam to be generated which will mix with the air as itenters thefiask. I The object of the invention is to provide a simple, economical and complete machine for making dental castings or the like.

Another object of the invention is to providea simple 'machine for making dental.

castings in which a substance under pressure will automatically exert ator'ce upon the flask or mold as the cap engages the flask.

-A further object ofthe invention is to .provide a simple machine for making dental castings which. is provided with a. hand. operated air compressor and a means for gencrating and mixing steam with the" air.

And a further objectof the invention is to provide a positive seal between the cap and the flask ofa machine for making dental castings or the like. i i

l/Vith these ends in View the invention em bodies a machinefhaving a base plate, a tank rigidly attached to the plate, a, hand operated air compressor, a swinging arm pivotally mounted at a point adjacent the upper end of the tank, a vertical plunger slidably mounted in the outer end of the arm, a lever for moving the plunger upward and downward, a flexible connection between the plunger and the tank, a movable cap at the lower end of the plunger, a valve in the plunger having a stem that will open the valve as the cap moves upward, a spring for holding the valve closed, and a ring of moistened paper in the lower side of the cap 1924. Serial no. 710,533.

for "forming a, tight seal between the cap and the flask. I

' Other features and advantagesof the invention will be seen from thefollowing descriptiontakenin connection with the-drawings, wherein I Figure 1 is a longitudinal section through the machine. v

omitted.

Figure 3'is a view showing an alternate arrangement. Inthe drawings I have shown any machine as it would be constructed wherein nu meral '1 indicates the base, numeral 2 the tank, and numeral 3 theplunger.

The base 1 may bemade of a flate plate of any suitable material having a boss 4 under v I Figure 2 is a plan. view with parts the center-line of the plunger, and a boss 5 with a recess 6-in. it into which the tank 2 may be placed. The'tank may be soldered 1n the recess or, rigidly held in anysuitablc manner; or it may be held to a post 7,by :15.

straps 8as shown in Figure 3. or attached to the base-in any other suitable manner. It is also understood'that the tankmay be of any suitable construction. In the design shown in Figure 1 I have shown-the tank 2 made with a cylindrical shaped piece of material 9 having threads 10 at the interior of its upper end into whicha heavy lever may s be screwed. The head 11' has a pin-12 projecting upward fromyit' upon which the plunger .3 is pivotally supported through anarm 13 and in the upper end'of the pin 12 is a threaded socket 14 into which an extension, which-indicated by dotted lines 1-5 may be screwed when it is desired to raise the arm 13. *The head 11 .may also be provided witha pressure gage 16, an outlet'1'7 which may be connected to the plunger 3 I through a section of flexible tubing. 18, and a pump 19 which is provided with a handle 20 so that it may readily be operated by hand. .A yoke 21 is pivotally attached to the hub 22 Of the arm 13 by pins 23 as shown in dotted lines in Figure 1 and its upper or opposite endis pivotally attached through a pin 24 to an arm 25 which is provided with a handle 26 at the opposite end and pivotally attached to a socket 27 though a pin 28 at the upper end of the plunger. I

The pl ger 3 is c n t u t d of a tubular shaped piece of material and provided with threads on the interior of its upper end into which the socket 27 is screwed. It is also understood that the socket 27 may be attached to the upper end of the plunger in any suitable manner. This plunger is slidably supported in a hole 28 in a hub 2.9 at the outer end of the arm 13. At the lower end of the plunger is a sleeve 30 with a valve 31 in its upper end and a cap 32 supported from its lower end. The cap 32 is provided with a shank 33, the sides of which taper from the ends toward the center as shown in Figure 1, which will make it possible for the cap 32 to twist slightly in order to align its.

face with the flask upon which it may be placed. The shank 33 is held in an opening in the sleeve 30 by a set screw 35 and is provided with an opening in its center which connects the upper end of the opening 34 with a plurality of small openings 37 so that as the valve 31 is opened compressed air will pass through the opening 36 and then through the small openings 37. This will cause the compressed air to be thorough- 1y broken up into small streai'ns as it passes through the opening 38 and trom there into a flask upon which the cap 32 maybe held. At the upper end o1 tne shank 33 is awasher 39 and above this is a projection 40 Which will engage a stem 11 on the lower side of the valve 31 as the cap 32 is forced upward. In the upper part of the plunger 3 is a spring 42 which will normally hold the valve 31 closed and it will be seen that as the plunger is forced downward by the handle 26 until the cap 32 engages an object, the cap will move upward and compress the spring 42 and open the valve 31. V

In the design shown in Figure 3 I have shown the post, upon which the arm 13 is mounted, rigidly held in the base with the tank 2 attached to it; as by using this design it will be possible to use any type of a small air tight tank instead of a tank with a special head as shown in Figure'l. In this design the plunger 3 is also provided I with a knob 43 at its upper end instead of the socket 27 so that the plunger may be readily forced downward by hand without the use of the lever 25. It will also be seen that in this design the plunger may be rotated about its pivot instead of being raised upward and downward.

It will be understood that changes may be made in the construction without departing from the spirit of the invention. One of which changes may be in the design of the base; another may be in the use of a different type of pump instead of the design shown;

and still another may be in the use of any suitable type of valve in place of the valve 31. p

The construction will be readily understood from the foregoing description. To use the device it may be assembled as shown and by moving the knob 20 upward and downward the tank 2 may be filled with compressed air which will pass through the tube 13 and into the upper part of the plunger 3. A flask containing a mold. with molten gold or any other suitable material, may be placed directly under the center of the plunger 3 and it will be seen that as the plunger. is forced downward wet paper which is indicated by the numeral 44- and shown in the outer ring of the cap will en} gage a ring at the top of the flask and form a positive seal, and atthe same time the, hot ring of the flask engaging the moist paper will cause steam to be generated which will mix with the compressed air and enter the flask with it. A slot 45 may be placedin the outer edge of the cap 32 so that the moist paper may readily be removed.

Having thus fully described the invention, what Tclaimv as new and desire to secure by Letters Patent, is 7 in a dental casting machine, a storage tank madeintegral therewith, a hand operrated air compressor adjacent the storage tank, a plunger with an automatically operated valve and a flexible connection between it and the storage tank, a cap at the lower end of the plunger, wet paper between projections on the under side of the cap, said cap having an opening through its center,

MELVILLE 1). GOODCHILD. 

